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Hi my friends!
I've implemented keil sample code for usb mass storage on my board that is designed base on Atmel AT91SAM7S256, chip.(keil\arm\boards\atmel\at91sam7s-ek\usb\memory\)
I tested it on 10 computer so : -in windows there is no problem and all computers recognize it and work correctly.
but: in three of them when my board is attached to, and I restart computers, my board prevent them to loading and those computers stop in primary steps of loading before load of windows.
in this state if I detach board from computer, loading continues and windows will be start.
I tested this problem with HID sample but there is no problem with Hid sample.
first priority for boot in these computers is ture, and there is no usb device in boot list in bios for this.
Can anyone help me??
thanks for your attention.
Do you mean you just tried it in 10 computers?
Or did you actually perform some proper testing to verify that all parameters are correct, and tolerant to the specification limits...?
Do these computers show the same symptoms with any other mass storage devices?
Hi!
yes, I just tried it in 10 computers. I'm not expert in usb protocols and parameters of them.
these computers don't show the same symptoms with any other mass storage devices such as flash drives. for example when a flash drive is attached to those, it takes 20 seconds to pass steps before load of windows but when my board is attached, it takes 7 minutes to pass steps.
We have the same problem with mass storage example on sam3s8b board;
thanks!